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ARM: pxa: add memory resource to SA1100 RTC device
[deliverable/linux.git] / kernel / trace / trace_output.c
1 /*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/ftrace.h>
11
12 #include "trace_output.h"
13
14 /* must be a power of 2 */
15 #define EVENT_HASHSIZE 128
16
17 DECLARE_RWSEM(trace_event_sem);
18
19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21 static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
24 {
25 struct trace_seq *s = &iter->seq;
26 struct trace_entry *entry = iter->ent;
27 struct bputs_entry *field;
28
29 trace_assign_type(field, entry);
30
31 trace_seq_puts(s, field->str);
32
33 return trace_handle_return(s);
34 }
35
36 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
37 {
38 struct trace_seq *s = &iter->seq;
39 struct trace_entry *entry = iter->ent;
40 struct bprint_entry *field;
41
42 trace_assign_type(field, entry);
43
44 trace_seq_bprintf(s, field->fmt, field->buf);
45
46 return trace_handle_return(s);
47 }
48
49 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
50 {
51 struct trace_seq *s = &iter->seq;
52 struct trace_entry *entry = iter->ent;
53 struct print_entry *field;
54
55 trace_assign_type(field, entry);
56
57 trace_seq_puts(s, field->buf);
58
59 return trace_handle_return(s);
60 }
61
62 const char *
63 trace_print_flags_seq(struct trace_seq *p, const char *delim,
64 unsigned long flags,
65 const struct trace_print_flags *flag_array)
66 {
67 unsigned long mask;
68 const char *str;
69 const char *ret = trace_seq_buffer_ptr(p);
70 int i, first = 1;
71
72 for (i = 0; flag_array[i].name && flags; i++) {
73
74 mask = flag_array[i].mask;
75 if ((flags & mask) != mask)
76 continue;
77
78 str = flag_array[i].name;
79 flags &= ~mask;
80 if (!first && delim)
81 trace_seq_puts(p, delim);
82 else
83 first = 0;
84 trace_seq_puts(p, str);
85 }
86
87 /* check for left over flags */
88 if (flags) {
89 if (!first && delim)
90 trace_seq_puts(p, delim);
91 trace_seq_printf(p, "0x%lx", flags);
92 }
93
94 trace_seq_putc(p, 0);
95
96 return ret;
97 }
98 EXPORT_SYMBOL(trace_print_flags_seq);
99
100 const char *
101 trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
102 const struct trace_print_flags *symbol_array)
103 {
104 int i;
105 const char *ret = trace_seq_buffer_ptr(p);
106
107 for (i = 0; symbol_array[i].name; i++) {
108
109 if (val != symbol_array[i].mask)
110 continue;
111
112 trace_seq_puts(p, symbol_array[i].name);
113 break;
114 }
115
116 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
117 trace_seq_printf(p, "0x%lx", val);
118
119 trace_seq_putc(p, 0);
120
121 return ret;
122 }
123 EXPORT_SYMBOL(trace_print_symbols_seq);
124
125 #if BITS_PER_LONG == 32
126 const char *
127 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
128 const struct trace_print_flags_u64 *symbol_array)
129 {
130 int i;
131 const char *ret = trace_seq_buffer_ptr(p);
132
133 for (i = 0; symbol_array[i].name; i++) {
134
135 if (val != symbol_array[i].mask)
136 continue;
137
138 trace_seq_puts(p, symbol_array[i].name);
139 break;
140 }
141
142 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
143 trace_seq_printf(p, "0x%llx", val);
144
145 trace_seq_putc(p, 0);
146
147 return ret;
148 }
149 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
150 #endif
151
152 const char *
153 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
154 unsigned int bitmask_size)
155 {
156 const char *ret = trace_seq_buffer_ptr(p);
157
158 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
159 trace_seq_putc(p, 0);
160
161 return ret;
162 }
163 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
164
165 const char *
166 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
167 {
168 int i;
169 const char *ret = trace_seq_buffer_ptr(p);
170
171 for (i = 0; i < buf_len; i++)
172 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
173
174 trace_seq_putc(p, 0);
175
176 return ret;
177 }
178 EXPORT_SYMBOL(trace_print_hex_seq);
179
180 const char *
181 trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
182 size_t el_size)
183 {
184 const char *ret = trace_seq_buffer_ptr(p);
185 const char *prefix = "";
186 void *ptr = (void *)buf;
187 size_t buf_len = count * el_size;
188
189 trace_seq_putc(p, '{');
190
191 while (ptr < buf + buf_len) {
192 switch (el_size) {
193 case 1:
194 trace_seq_printf(p, "%s0x%x", prefix,
195 *(u8 *)ptr);
196 break;
197 case 2:
198 trace_seq_printf(p, "%s0x%x", prefix,
199 *(u16 *)ptr);
200 break;
201 case 4:
202 trace_seq_printf(p, "%s0x%x", prefix,
203 *(u32 *)ptr);
204 break;
205 case 8:
206 trace_seq_printf(p, "%s0x%llx", prefix,
207 *(u64 *)ptr);
208 break;
209 default:
210 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
211 *(u8 *)ptr);
212 el_size = 1;
213 }
214 prefix = ",";
215 ptr += el_size;
216 }
217
218 trace_seq_putc(p, '}');
219 trace_seq_putc(p, 0);
220
221 return ret;
222 }
223 EXPORT_SYMBOL(trace_print_array_seq);
224
225 int trace_raw_output_prep(struct trace_iterator *iter,
226 struct trace_event *trace_event)
227 {
228 struct trace_event_call *event;
229 struct trace_seq *s = &iter->seq;
230 struct trace_seq *p = &iter->tmp_seq;
231 struct trace_entry *entry;
232
233 event = container_of(trace_event, struct trace_event_call, event);
234 entry = iter->ent;
235
236 if (entry->type != event->event.type) {
237 WARN_ON_ONCE(1);
238 return TRACE_TYPE_UNHANDLED;
239 }
240
241 trace_seq_init(p);
242 trace_seq_printf(s, "%s: ", trace_event_name(event));
243
244 return trace_handle_return(s);
245 }
246 EXPORT_SYMBOL(trace_raw_output_prep);
247
248 static int trace_output_raw(struct trace_iterator *iter, char *name,
249 char *fmt, va_list ap)
250 {
251 struct trace_seq *s = &iter->seq;
252
253 trace_seq_printf(s, "%s: ", name);
254 trace_seq_vprintf(s, fmt, ap);
255
256 return trace_handle_return(s);
257 }
258
259 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
260 {
261 va_list ap;
262 int ret;
263
264 va_start(ap, fmt);
265 ret = trace_output_raw(iter, name, fmt, ap);
266 va_end(ap);
267
268 return ret;
269 }
270 EXPORT_SYMBOL_GPL(trace_output_call);
271
272 #ifdef CONFIG_KRETPROBES
273 static inline const char *kretprobed(const char *name)
274 {
275 static const char tramp_name[] = "kretprobe_trampoline";
276 int size = sizeof(tramp_name);
277
278 if (strncmp(tramp_name, name, size) == 0)
279 return "[unknown/kretprobe'd]";
280 return name;
281 }
282 #else
283 static inline const char *kretprobed(const char *name)
284 {
285 return name;
286 }
287 #endif /* CONFIG_KRETPROBES */
288
289 static void
290 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
291 {
292 #ifdef CONFIG_KALLSYMS
293 char str[KSYM_SYMBOL_LEN];
294 const char *name;
295
296 kallsyms_lookup(address, NULL, NULL, NULL, str);
297
298 name = kretprobed(str);
299
300 trace_seq_printf(s, fmt, name);
301 #endif
302 }
303
304 static void
305 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
306 unsigned long address)
307 {
308 #ifdef CONFIG_KALLSYMS
309 char str[KSYM_SYMBOL_LEN];
310 const char *name;
311
312 sprint_symbol(str, address);
313 name = kretprobed(str);
314
315 trace_seq_printf(s, fmt, name);
316 #endif
317 }
318
319 #ifndef CONFIG_64BIT
320 # define IP_FMT "%08lx"
321 #else
322 # define IP_FMT "%016lx"
323 #endif
324
325 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
326 unsigned long ip, unsigned long sym_flags)
327 {
328 struct file *file = NULL;
329 unsigned long vmstart = 0;
330 int ret = 1;
331
332 if (s->full)
333 return 0;
334
335 if (mm) {
336 const struct vm_area_struct *vma;
337
338 down_read(&mm->mmap_sem);
339 vma = find_vma(mm, ip);
340 if (vma) {
341 file = vma->vm_file;
342 vmstart = vma->vm_start;
343 }
344 if (file) {
345 ret = trace_seq_path(s, &file->f_path);
346 if (ret)
347 trace_seq_printf(s, "[+0x%lx]",
348 ip - vmstart);
349 }
350 up_read(&mm->mmap_sem);
351 }
352 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
353 trace_seq_printf(s, " <" IP_FMT ">", ip);
354 return !trace_seq_has_overflowed(s);
355 }
356
357 int
358 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
359 unsigned long sym_flags)
360 {
361 struct mm_struct *mm = NULL;
362 unsigned int i;
363
364 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
365 struct task_struct *task;
366 /*
367 * we do the lookup on the thread group leader,
368 * since individual threads might have already quit!
369 */
370 rcu_read_lock();
371 task = find_task_by_vpid(entry->tgid);
372 if (task)
373 mm = get_task_mm(task);
374 rcu_read_unlock();
375 }
376
377 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
378 unsigned long ip = entry->caller[i];
379
380 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
381 break;
382
383 trace_seq_puts(s, " => ");
384
385 if (!ip) {
386 trace_seq_puts(s, "??");
387 trace_seq_putc(s, '\n');
388 continue;
389 }
390
391 seq_print_user_ip(s, mm, ip, sym_flags);
392 trace_seq_putc(s, '\n');
393 }
394
395 if (mm)
396 mmput(mm);
397
398 return !trace_seq_has_overflowed(s);
399 }
400
401 int
402 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
403 {
404 if (!ip) {
405 trace_seq_putc(s, '0');
406 goto out;
407 }
408
409 if (sym_flags & TRACE_ITER_SYM_OFFSET)
410 seq_print_sym_offset(s, "%s", ip);
411 else
412 seq_print_sym_short(s, "%s", ip);
413
414 if (sym_flags & TRACE_ITER_SYM_ADDR)
415 trace_seq_printf(s, " <" IP_FMT ">", ip);
416
417 out:
418 return !trace_seq_has_overflowed(s);
419 }
420
421 /**
422 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
423 * @s: trace seq struct to write to
424 * @entry: The trace entry field from the ring buffer
425 *
426 * Prints the generic fields of irqs off, in hard or softirq, preempt
427 * count.
428 */
429 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
430 {
431 char hardsoft_irq;
432 char need_resched;
433 char irqs_off;
434 int hardirq;
435 int softirq;
436
437 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
438 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
439
440 irqs_off =
441 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
442 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
443 '.';
444
445 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
446 TRACE_FLAG_PREEMPT_RESCHED)) {
447 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
448 need_resched = 'N';
449 break;
450 case TRACE_FLAG_NEED_RESCHED:
451 need_resched = 'n';
452 break;
453 case TRACE_FLAG_PREEMPT_RESCHED:
454 need_resched = 'p';
455 break;
456 default:
457 need_resched = '.';
458 break;
459 }
460
461 hardsoft_irq =
462 (hardirq && softirq) ? 'H' :
463 hardirq ? 'h' :
464 softirq ? 's' :
465 '.';
466
467 trace_seq_printf(s, "%c%c%c",
468 irqs_off, need_resched, hardsoft_irq);
469
470 if (entry->preempt_count)
471 trace_seq_printf(s, "%x", entry->preempt_count);
472 else
473 trace_seq_putc(s, '.');
474
475 return !trace_seq_has_overflowed(s);
476 }
477
478 static int
479 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
480 {
481 char comm[TASK_COMM_LEN];
482
483 trace_find_cmdline(entry->pid, comm);
484
485 trace_seq_printf(s, "%8.8s-%-5d %3d",
486 comm, entry->pid, cpu);
487
488 return trace_print_lat_fmt(s, entry);
489 }
490
491 #undef MARK
492 #define MARK(v, s) {.val = v, .sym = s}
493 /* trace overhead mark */
494 static const struct trace_mark {
495 unsigned long long val; /* unit: nsec */
496 char sym;
497 } mark[] = {
498 MARK(1000000000ULL , '$'), /* 1 sec */
499 MARK(1000000ULL , '#'), /* 1000 usecs */
500 MARK(100000ULL , '!'), /* 100 usecs */
501 MARK(10000ULL , '+'), /* 10 usecs */
502 };
503 #undef MARK
504
505 char trace_find_mark(unsigned long long d)
506 {
507 int i;
508 int size = ARRAY_SIZE(mark);
509
510 for (i = 0; i < size; i++) {
511 if (d >= mark[i].val)
512 break;
513 }
514
515 return (i == size) ? ' ' : mark[i].sym;
516 }
517
518 static int
519 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
520 {
521 unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
522 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
523 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
524 unsigned long long rel_ts = next_ts - iter->ts;
525 struct trace_seq *s = &iter->seq;
526
527 if (in_ns) {
528 abs_ts = ns2usecs(abs_ts);
529 rel_ts = ns2usecs(rel_ts);
530 }
531
532 if (verbose && in_ns) {
533 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
534 unsigned long abs_msec = (unsigned long)abs_ts;
535 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
536 unsigned long rel_msec = (unsigned long)rel_ts;
537
538 trace_seq_printf(
539 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
540 ns2usecs(iter->ts),
541 abs_msec, abs_usec,
542 rel_msec, rel_usec);
543
544 } else if (verbose && !in_ns) {
545 trace_seq_printf(
546 s, "[%016llx] %lld (+%lld): ",
547 iter->ts, abs_ts, rel_ts);
548
549 } else if (!verbose && in_ns) {
550 trace_seq_printf(
551 s, " %4lldus%c: ",
552 abs_ts,
553 trace_find_mark(rel_ts * NSEC_PER_USEC));
554
555 } else { /* !verbose && !in_ns */
556 trace_seq_printf(s, " %4lld: ", abs_ts);
557 }
558
559 return !trace_seq_has_overflowed(s);
560 }
561
562 int trace_print_context(struct trace_iterator *iter)
563 {
564 struct trace_seq *s = &iter->seq;
565 struct trace_entry *entry = iter->ent;
566 unsigned long long t;
567 unsigned long secs, usec_rem;
568 char comm[TASK_COMM_LEN];
569
570 trace_find_cmdline(entry->pid, comm);
571
572 trace_seq_printf(s, "%16s-%-5d [%03d] ",
573 comm, entry->pid, iter->cpu);
574
575 if (trace_flags & TRACE_ITER_IRQ_INFO)
576 trace_print_lat_fmt(s, entry);
577
578 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
579 t = ns2usecs(iter->ts);
580 usec_rem = do_div(t, USEC_PER_SEC);
581 secs = (unsigned long)t;
582 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
583 } else
584 trace_seq_printf(s, " %12llu: ", iter->ts);
585
586 return !trace_seq_has_overflowed(s);
587 }
588
589 int trace_print_lat_context(struct trace_iterator *iter)
590 {
591 u64 next_ts;
592 /* trace_find_next_entry will reset ent_size */
593 int ent_size = iter->ent_size;
594 struct trace_seq *s = &iter->seq;
595 struct trace_entry *entry = iter->ent,
596 *next_entry = trace_find_next_entry(iter, NULL,
597 &next_ts);
598 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
599
600 /* Restore the original ent_size */
601 iter->ent_size = ent_size;
602
603 if (!next_entry)
604 next_ts = iter->ts;
605
606 if (verbose) {
607 char comm[TASK_COMM_LEN];
608
609 trace_find_cmdline(entry->pid, comm);
610
611 trace_seq_printf(
612 s, "%16s %5d %3d %d %08x %08lx ",
613 comm, entry->pid, iter->cpu, entry->flags,
614 entry->preempt_count, iter->idx);
615 } else {
616 lat_print_generic(s, entry, iter->cpu);
617 }
618
619 lat_print_timestamp(iter, next_ts);
620
621 return !trace_seq_has_overflowed(s);
622 }
623
624 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
625
626 static int task_state_char(unsigned long state)
627 {
628 int bit = state ? __ffs(state) + 1 : 0;
629
630 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
631 }
632
633 /**
634 * ftrace_find_event - find a registered event
635 * @type: the type of event to look for
636 *
637 * Returns an event of type @type otherwise NULL
638 * Called with trace_event_read_lock() held.
639 */
640 struct trace_event *ftrace_find_event(int type)
641 {
642 struct trace_event *event;
643 unsigned key;
644
645 key = type & (EVENT_HASHSIZE - 1);
646
647 hlist_for_each_entry(event, &event_hash[key], node) {
648 if (event->type == type)
649 return event;
650 }
651
652 return NULL;
653 }
654
655 static LIST_HEAD(ftrace_event_list);
656
657 static int trace_search_list(struct list_head **list)
658 {
659 struct trace_event *e;
660 int last = __TRACE_LAST_TYPE;
661
662 if (list_empty(&ftrace_event_list)) {
663 *list = &ftrace_event_list;
664 return last + 1;
665 }
666
667 /*
668 * We used up all possible max events,
669 * lets see if somebody freed one.
670 */
671 list_for_each_entry(e, &ftrace_event_list, list) {
672 if (e->type != last + 1)
673 break;
674 last++;
675 }
676
677 /* Did we used up all 65 thousand events??? */
678 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
679 return 0;
680
681 *list = &e->list;
682 return last + 1;
683 }
684
685 void trace_event_read_lock(void)
686 {
687 down_read(&trace_event_sem);
688 }
689
690 void trace_event_read_unlock(void)
691 {
692 up_read(&trace_event_sem);
693 }
694
695 /**
696 * register_trace_event - register output for an event type
697 * @event: the event type to register
698 *
699 * Event types are stored in a hash and this hash is used to
700 * find a way to print an event. If the @event->type is set
701 * then it will use that type, otherwise it will assign a
702 * type to use.
703 *
704 * If you assign your own type, please make sure it is added
705 * to the trace_type enum in trace.h, to avoid collisions
706 * with the dynamic types.
707 *
708 * Returns the event type number or zero on error.
709 */
710 int register_trace_event(struct trace_event *event)
711 {
712 unsigned key;
713 int ret = 0;
714
715 down_write(&trace_event_sem);
716
717 if (WARN_ON(!event))
718 goto out;
719
720 if (WARN_ON(!event->funcs))
721 goto out;
722
723 INIT_LIST_HEAD(&event->list);
724
725 if (!event->type) {
726 struct list_head *list = NULL;
727
728 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
729
730 event->type = trace_search_list(&list);
731 if (!event->type)
732 goto out;
733
734 } else {
735
736 event->type = next_event_type++;
737 list = &ftrace_event_list;
738 }
739
740 if (WARN_ON(ftrace_find_event(event->type)))
741 goto out;
742
743 list_add_tail(&event->list, list);
744
745 } else if (event->type > __TRACE_LAST_TYPE) {
746 printk(KERN_WARNING "Need to add type to trace.h\n");
747 WARN_ON(1);
748 goto out;
749 } else {
750 /* Is this event already used */
751 if (ftrace_find_event(event->type))
752 goto out;
753 }
754
755 if (event->funcs->trace == NULL)
756 event->funcs->trace = trace_nop_print;
757 if (event->funcs->raw == NULL)
758 event->funcs->raw = trace_nop_print;
759 if (event->funcs->hex == NULL)
760 event->funcs->hex = trace_nop_print;
761 if (event->funcs->binary == NULL)
762 event->funcs->binary = trace_nop_print;
763
764 key = event->type & (EVENT_HASHSIZE - 1);
765
766 hlist_add_head(&event->node, &event_hash[key]);
767
768 ret = event->type;
769 out:
770 up_write(&trace_event_sem);
771
772 return ret;
773 }
774 EXPORT_SYMBOL_GPL(register_trace_event);
775
776 /*
777 * Used by module code with the trace_event_sem held for write.
778 */
779 int __unregister_trace_event(struct trace_event *event)
780 {
781 hlist_del(&event->node);
782 list_del(&event->list);
783 return 0;
784 }
785
786 /**
787 * unregister_trace_event - remove a no longer used event
788 * @event: the event to remove
789 */
790 int unregister_trace_event(struct trace_event *event)
791 {
792 down_write(&trace_event_sem);
793 __unregister_trace_event(event);
794 up_write(&trace_event_sem);
795
796 return 0;
797 }
798 EXPORT_SYMBOL_GPL(unregister_trace_event);
799
800 /*
801 * Standard events
802 */
803
804 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
805 struct trace_event *event)
806 {
807 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
808
809 return trace_handle_return(&iter->seq);
810 }
811
812 /* TRACE_FN */
813 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
814 struct trace_event *event)
815 {
816 struct ftrace_entry *field;
817 struct trace_seq *s = &iter->seq;
818
819 trace_assign_type(field, iter->ent);
820
821 seq_print_ip_sym(s, field->ip, flags);
822
823 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
824 trace_seq_puts(s, " <-");
825 seq_print_ip_sym(s, field->parent_ip, flags);
826 }
827
828 trace_seq_putc(s, '\n');
829
830 return trace_handle_return(s);
831 }
832
833 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
834 struct trace_event *event)
835 {
836 struct ftrace_entry *field;
837
838 trace_assign_type(field, iter->ent);
839
840 trace_seq_printf(&iter->seq, "%lx %lx\n",
841 field->ip,
842 field->parent_ip);
843
844 return trace_handle_return(&iter->seq);
845 }
846
847 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
848 struct trace_event *event)
849 {
850 struct ftrace_entry *field;
851 struct trace_seq *s = &iter->seq;
852
853 trace_assign_type(field, iter->ent);
854
855 SEQ_PUT_HEX_FIELD(s, field->ip);
856 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
857
858 return trace_handle_return(s);
859 }
860
861 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
862 struct trace_event *event)
863 {
864 struct ftrace_entry *field;
865 struct trace_seq *s = &iter->seq;
866
867 trace_assign_type(field, iter->ent);
868
869 SEQ_PUT_FIELD(s, field->ip);
870 SEQ_PUT_FIELD(s, field->parent_ip);
871
872 return trace_handle_return(s);
873 }
874
875 static struct trace_event_functions trace_fn_funcs = {
876 .trace = trace_fn_trace,
877 .raw = trace_fn_raw,
878 .hex = trace_fn_hex,
879 .binary = trace_fn_bin,
880 };
881
882 static struct trace_event trace_fn_event = {
883 .type = TRACE_FN,
884 .funcs = &trace_fn_funcs,
885 };
886
887 /* TRACE_CTX an TRACE_WAKE */
888 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
889 char *delim)
890 {
891 struct ctx_switch_entry *field;
892 char comm[TASK_COMM_LEN];
893 int S, T;
894
895
896 trace_assign_type(field, iter->ent);
897
898 T = task_state_char(field->next_state);
899 S = task_state_char(field->prev_state);
900 trace_find_cmdline(field->next_pid, comm);
901 trace_seq_printf(&iter->seq,
902 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
903 field->prev_pid,
904 field->prev_prio,
905 S, delim,
906 field->next_cpu,
907 field->next_pid,
908 field->next_prio,
909 T, comm);
910
911 return trace_handle_return(&iter->seq);
912 }
913
914 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
915 struct trace_event *event)
916 {
917 return trace_ctxwake_print(iter, "==>");
918 }
919
920 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
921 int flags, struct trace_event *event)
922 {
923 return trace_ctxwake_print(iter, " +");
924 }
925
926 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
927 {
928 struct ctx_switch_entry *field;
929 int T;
930
931 trace_assign_type(field, iter->ent);
932
933 if (!S)
934 S = task_state_char(field->prev_state);
935 T = task_state_char(field->next_state);
936 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
937 field->prev_pid,
938 field->prev_prio,
939 S,
940 field->next_cpu,
941 field->next_pid,
942 field->next_prio,
943 T);
944
945 return trace_handle_return(&iter->seq);
946 }
947
948 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
949 struct trace_event *event)
950 {
951 return trace_ctxwake_raw(iter, 0);
952 }
953
954 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
955 struct trace_event *event)
956 {
957 return trace_ctxwake_raw(iter, '+');
958 }
959
960
961 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
962 {
963 struct ctx_switch_entry *field;
964 struct trace_seq *s = &iter->seq;
965 int T;
966
967 trace_assign_type(field, iter->ent);
968
969 if (!S)
970 S = task_state_char(field->prev_state);
971 T = task_state_char(field->next_state);
972
973 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
974 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
975 SEQ_PUT_HEX_FIELD(s, S);
976 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
977 SEQ_PUT_HEX_FIELD(s, field->next_pid);
978 SEQ_PUT_HEX_FIELD(s, field->next_prio);
979 SEQ_PUT_HEX_FIELD(s, T);
980
981 return trace_handle_return(s);
982 }
983
984 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
985 struct trace_event *event)
986 {
987 return trace_ctxwake_hex(iter, 0);
988 }
989
990 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
991 struct trace_event *event)
992 {
993 return trace_ctxwake_hex(iter, '+');
994 }
995
996 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
997 int flags, struct trace_event *event)
998 {
999 struct ctx_switch_entry *field;
1000 struct trace_seq *s = &iter->seq;
1001
1002 trace_assign_type(field, iter->ent);
1003
1004 SEQ_PUT_FIELD(s, field->prev_pid);
1005 SEQ_PUT_FIELD(s, field->prev_prio);
1006 SEQ_PUT_FIELD(s, field->prev_state);
1007 SEQ_PUT_FIELD(s, field->next_cpu);
1008 SEQ_PUT_FIELD(s, field->next_pid);
1009 SEQ_PUT_FIELD(s, field->next_prio);
1010 SEQ_PUT_FIELD(s, field->next_state);
1011
1012 return trace_handle_return(s);
1013 }
1014
1015 static struct trace_event_functions trace_ctx_funcs = {
1016 .trace = trace_ctx_print,
1017 .raw = trace_ctx_raw,
1018 .hex = trace_ctx_hex,
1019 .binary = trace_ctxwake_bin,
1020 };
1021
1022 static struct trace_event trace_ctx_event = {
1023 .type = TRACE_CTX,
1024 .funcs = &trace_ctx_funcs,
1025 };
1026
1027 static struct trace_event_functions trace_wake_funcs = {
1028 .trace = trace_wake_print,
1029 .raw = trace_wake_raw,
1030 .hex = trace_wake_hex,
1031 .binary = trace_ctxwake_bin,
1032 };
1033
1034 static struct trace_event trace_wake_event = {
1035 .type = TRACE_WAKE,
1036 .funcs = &trace_wake_funcs,
1037 };
1038
1039 /* TRACE_STACK */
1040
1041 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1042 int flags, struct trace_event *event)
1043 {
1044 struct stack_entry *field;
1045 struct trace_seq *s = &iter->seq;
1046 unsigned long *p;
1047 unsigned long *end;
1048
1049 trace_assign_type(field, iter->ent);
1050 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1051
1052 trace_seq_puts(s, "<stack trace>\n");
1053
1054 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1055
1056 if (trace_seq_has_overflowed(s))
1057 break;
1058
1059 trace_seq_puts(s, " => ");
1060 seq_print_ip_sym(s, *p, flags);
1061 trace_seq_putc(s, '\n');
1062 }
1063
1064 return trace_handle_return(s);
1065 }
1066
1067 static struct trace_event_functions trace_stack_funcs = {
1068 .trace = trace_stack_print,
1069 };
1070
1071 static struct trace_event trace_stack_event = {
1072 .type = TRACE_STACK,
1073 .funcs = &trace_stack_funcs,
1074 };
1075
1076 /* TRACE_USER_STACK */
1077 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1078 int flags, struct trace_event *event)
1079 {
1080 struct userstack_entry *field;
1081 struct trace_seq *s = &iter->seq;
1082
1083 trace_assign_type(field, iter->ent);
1084
1085 trace_seq_puts(s, "<user stack trace>\n");
1086 seq_print_userip_objs(field, s, flags);
1087
1088 return trace_handle_return(s);
1089 }
1090
1091 static struct trace_event_functions trace_user_stack_funcs = {
1092 .trace = trace_user_stack_print,
1093 };
1094
1095 static struct trace_event trace_user_stack_event = {
1096 .type = TRACE_USER_STACK,
1097 .funcs = &trace_user_stack_funcs,
1098 };
1099
1100 /* TRACE_BPUTS */
1101 static enum print_line_t
1102 trace_bputs_print(struct trace_iterator *iter, int flags,
1103 struct trace_event *event)
1104 {
1105 struct trace_entry *entry = iter->ent;
1106 struct trace_seq *s = &iter->seq;
1107 struct bputs_entry *field;
1108
1109 trace_assign_type(field, entry);
1110
1111 seq_print_ip_sym(s, field->ip, flags);
1112 trace_seq_puts(s, ": ");
1113 trace_seq_puts(s, field->str);
1114
1115 return trace_handle_return(s);
1116 }
1117
1118
1119 static enum print_line_t
1120 trace_bputs_raw(struct trace_iterator *iter, int flags,
1121 struct trace_event *event)
1122 {
1123 struct bputs_entry *field;
1124 struct trace_seq *s = &iter->seq;
1125
1126 trace_assign_type(field, iter->ent);
1127
1128 trace_seq_printf(s, ": %lx : ", field->ip);
1129 trace_seq_puts(s, field->str);
1130
1131 return trace_handle_return(s);
1132 }
1133
1134 static struct trace_event_functions trace_bputs_funcs = {
1135 .trace = trace_bputs_print,
1136 .raw = trace_bputs_raw,
1137 };
1138
1139 static struct trace_event trace_bputs_event = {
1140 .type = TRACE_BPUTS,
1141 .funcs = &trace_bputs_funcs,
1142 };
1143
1144 /* TRACE_BPRINT */
1145 static enum print_line_t
1146 trace_bprint_print(struct trace_iterator *iter, int flags,
1147 struct trace_event *event)
1148 {
1149 struct trace_entry *entry = iter->ent;
1150 struct trace_seq *s = &iter->seq;
1151 struct bprint_entry *field;
1152
1153 trace_assign_type(field, entry);
1154
1155 seq_print_ip_sym(s, field->ip, flags);
1156 trace_seq_puts(s, ": ");
1157 trace_seq_bprintf(s, field->fmt, field->buf);
1158
1159 return trace_handle_return(s);
1160 }
1161
1162
1163 static enum print_line_t
1164 trace_bprint_raw(struct trace_iterator *iter, int flags,
1165 struct trace_event *event)
1166 {
1167 struct bprint_entry *field;
1168 struct trace_seq *s = &iter->seq;
1169
1170 trace_assign_type(field, iter->ent);
1171
1172 trace_seq_printf(s, ": %lx : ", field->ip);
1173 trace_seq_bprintf(s, field->fmt, field->buf);
1174
1175 return trace_handle_return(s);
1176 }
1177
1178 static struct trace_event_functions trace_bprint_funcs = {
1179 .trace = trace_bprint_print,
1180 .raw = trace_bprint_raw,
1181 };
1182
1183 static struct trace_event trace_bprint_event = {
1184 .type = TRACE_BPRINT,
1185 .funcs = &trace_bprint_funcs,
1186 };
1187
1188 /* TRACE_PRINT */
1189 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1190 int flags, struct trace_event *event)
1191 {
1192 struct print_entry *field;
1193 struct trace_seq *s = &iter->seq;
1194
1195 trace_assign_type(field, iter->ent);
1196
1197 seq_print_ip_sym(s, field->ip, flags);
1198 trace_seq_printf(s, ": %s", field->buf);
1199
1200 return trace_handle_return(s);
1201 }
1202
1203 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1204 struct trace_event *event)
1205 {
1206 struct print_entry *field;
1207
1208 trace_assign_type(field, iter->ent);
1209
1210 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1211
1212 return trace_handle_return(&iter->seq);
1213 }
1214
1215 static struct trace_event_functions trace_print_funcs = {
1216 .trace = trace_print_print,
1217 .raw = trace_print_raw,
1218 };
1219
1220 static struct trace_event trace_print_event = {
1221 .type = TRACE_PRINT,
1222 .funcs = &trace_print_funcs,
1223 };
1224
1225
1226 static struct trace_event *events[] __initdata = {
1227 &trace_fn_event,
1228 &trace_ctx_event,
1229 &trace_wake_event,
1230 &trace_stack_event,
1231 &trace_user_stack_event,
1232 &trace_bputs_event,
1233 &trace_bprint_event,
1234 &trace_print_event,
1235 NULL
1236 };
1237
1238 __init static int init_events(void)
1239 {
1240 struct trace_event *event;
1241 int i, ret;
1242
1243 for (i = 0; events[i]; i++) {
1244 event = events[i];
1245
1246 ret = register_trace_event(event);
1247 if (!ret) {
1248 printk(KERN_WARNING "event %d failed to register\n",
1249 event->type);
1250 WARN_ON_ONCE(1);
1251 }
1252 }
1253
1254 return 0;
1255 }
1256 early_initcall(init_events);
Linux kernel - Deliverables
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